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Theory of the Relaxation Processes for Multilevel Spin Systems in Dilute Paramagnetic Solids at High Temperature
Author(s) -
Popescu E. F.
Publication year - 1999
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/(sici)1521-3951(199907)214:1<113::aid-pssb113>3.0.co;2-e
Subject(s) - paramagnetism , condensed matter physics , spin–lattice relaxation , relaxation (psychology) , lattice (music) , formalism (music) , density matrix , thermodynamics , chemistry , physics , quantum mechanics , psychology , social psychology , musical , art , acoustics , visual arts , quantum
A direct density matrix treatment of the relaxation processes in dilute paramagnetic solids at high temperature is performed. Using the “dressed state” formalism, the theory is developed differently from the one often referred to as the “Redfield Theory”, which uses the concepts of correlation function and relaxation matrix. General expressions for the linewidths and spin–lattice relaxation rates are obtained in the high temperature limit, for a lattice with infinite specific heat and up to strong microwave fields. In addition, the theory predicts experimental proofs for those cases where the concept of relaxation matrix ceases to be correct, or the lattice cannot be considered as having an infinite specific heat.